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LANCOM ES-2126+ und LANCOM ES-2126P+
쮿 Kapitel 4: Anleitung zum webbasierten Management
64
DE
4.7 IGMP Snooping
Die Funktion IGMP Snooping dient zur Organisation von Multicast-Gruppen.
IGMP Snooping sendet die Multicast-Pakete zu den Ports der VLAN-Gruppe.
Durch IP-Multicast-Pakete im Netzwerk wird die Bandbreite nicht unnötig
belastet. Das liegt daran, dass ein Switch, der kein IGMP oder IGMP-Snooping
unterstützt, Multicast- und Broadcast-Pakete nicht unterscheiden kann. Ohne
IGMP Snooping unterscheidet sich das Senden von Multicast-Paketen daher
nicht vom Senden von Broadcast-Paketen.
Ein Switch unterstützt IGMP Snooping mit den folgenden Funktionen: Anfra-
gen, Anmelden und Verlassen. Ein Paket-Typ, der zwischen einem IP-Multi-
cast-Router bzw. einem Switch und einem IP-Multicast-Host ausgetauscht
wird, kann die Informationen des Multicast-Table updaten, wenn ein Mitglied
(Port) zu einer IP-Multicast-Zieladresse hinzukommt oder sie verlässt. Wenn
der Switch ein IP-Multicast-Paket bekommt, kann er es mit dieser Funktion an
die Mitglieder senden, die vorher in eine bestimmte IP-Multicast-Gruppe ein-
getreten sind. IGMP Snooping verwirft die Pakete, wenn der Benutzer Multi-
cast-Pakete zu einer Multicast-Gruppe schickt, die nicht im Vorfeld erstellt
wurde.
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